The mechanistic aspects of improved aqueous removal of methyl orange (MO) dyes using high performance novel magnetic MgAlNi barium-ferrite (MgAlNi-BaFe) ternary double layer hydroxide (LDH) nanocomposites is reported in this study. Detailed surface characterization coupled with kinetic, equilibrium, thermodynamics and regeneration studies were undertaken under different operational conditions of temperature (298–318 K), initial concentration (20–100 mg/L), pH (2–6). The kinetic results show that MO sorption was mainly, associated with pseudo-second order and intra-particular diffusion process. The MO adsorption onto the MgAlNi-BaFe nanocomposites suggests a multi-layered sorption process that is endothermic and spontaneous in nature. The MO adsorption mechanism insight taken in cognizance of FTIR, XRD, pKa, zeta potential, the adsorbates surface functional groups and the adsorbate-adsorbent surface charges interactions suggest involvement of hydrogen bonding and n-π interactions, predominantly via physisorption process (ΔG° = −7.406 to −5.69 kJ/mol). The excellent adsorptive performance of the MgAlNi-BaFe adsorbents for removal of MO from water compared with other magnetic LDH nanocomposites was further elucidated via the MgAlNi-BaFe nanomaterials high rates of regeneration and superior performances for three successive desorption-adsorption cycles. This study demonstrates the high potentials of employing MgAlNi-BaFe nanomaterials for removal of dyes from water and wastewater.

在这项研究中报告了使用高性能新型磁性MgAlNi铁氧体钡（MgAlNi-BaFe）三元双层氢氧化物（LDH）纳米复合材料改善水去除甲基橙（MO）染料的机理。在不同的温度（298–318 K），初始浓度（20–100 mg / L），pH（2–6）的不同操作条件下，进行了详细的表面表征以及动力学，平衡，热力学和再生研究。动力学结果表明，MO的吸附主要与假二级反应和颗粒内扩散过程有关。MO吸附在MgAlNi-BaFe纳米复合材料上表明了吸热和自然发生的多层吸附过程。通过对FTIR，XRD，pKa，ζ电位，被吸附物的表面官能团和被吸附物与吸附剂的表面电荷的相互作用表明氢键和n-π相互作用的参与，主要是通过物理吸附过程（ΔG°= -7.406至-5.69 kJ / mol）。通过MgAlNi-BaFe纳米材料的高再生速率和三个连续的解吸-吸附循环的优异性能，进一步阐明了MgAlNi-BaFe吸附剂与其他磁性LDH纳米复合材料相比从水中去除MO的优异吸附性能。这项研究证明了使用MgAlNi-BaFe纳米材料从水和废水中去除染料的巨大潜力。406至-5.69 kJ / mol）。通过MgAlNi-BaFe纳米材料的高再生速率和三个连续的解吸-吸附循环的优异性能，进一步阐明了MgAlNi-BaFe吸附剂与其他磁性LDH纳米复合材料相比从水中去除MO的优异吸附性能。这项研究证明了使用MgAlNi-BaFe纳米材料从水和废水中去除染料的巨大潜力。406至-5.69 kJ / mol）。通过MgAlNi-BaFe纳米材料的高再生速率和三个连续的解吸-吸附循环的优异性能，进一步阐明了MgAlNi-BaFe吸附剂与其他磁性LDH纳米复合材料相比从水中去除MO的优异吸附性能。这项研究证明了使用MgAlNi-BaFe纳米材料从水和废水中去除染料的巨大潜力。